From local holes-in-the-wall to trendy clandestine establishments, travelers to Europe have plenty of ways to veer off the tired tourist track when they dine. At these hidden spots, whether a secret late-night bakery in Lisbon or a dynamic pop-up in London, diners can immerse themselves in the local culture and be in the know despite being far from home.

On a recent stopover in Lisbon, I met up with Frederico Duarte, Lisboeta and coauthor of Fabrico Proprio, a book (and ongoing project) on the design of Portuguese pastry. He led me on a late-night trek in search of the city's underground bakeries, an adventure that became the inspiration for this story on hidden eats in Europe.

Read on to discover these pastry havens, plus lesser-known dining spots in other great European cities.